Art or Maths

I just finished my first week as a year 12, and I took maths, and I'm finding it super difficult. I got an A at GSCE (after sacrificing my pe theory grade to get more maths revision oops), but a level is so much harder. My class just seem to get everything straight away, so the teacher moves on, even if I say anything, because I don't understand. I've been at lunch to try and catch up but I just don't understand it.

My point is, I'm thinking of swapping maths for art, as I got an A* at GSCE and I know it would be the same teacher. Should I swap? I'm already doing chemistry so that's kind of "mathsy" if I do decide to go to uni.

I don't know whether I should swap or not.